Änderungen

K
→‎WLAN-Theorie: +1mbit @ 256 bytes frag
Zeile 17: Zeile 17:  
* 802.11-Frame = DIFS + long_preamble + TCP + long_preamble + 802.11ack + SIFS
 
* 802.11-Frame = DIFS + long_preamble + TCP + long_preamble + 802.11ack + SIFS
 
* TCP_HEADER/DATA bei MTU 1500 = 1460 Bytes + 40 Bytes Header + 28 Bytes Control/Management + 8 SNAP = 1536 Bytes
 
* TCP_HEADER/DATA bei MTU 1500 = 1460 Bytes + 40 Bytes Header + 28 Bytes Control/Management + 8 SNAP = 1536 Bytes
* TCP_HEADER/ACK = 40 + 36 = 76 Bytes
+
* TCP_HEADER/ACK = 40 Bytes Header + 28 Bytes Control/Management + 8 SNAP = 76 Bytes
 +
 
 
** 1mbit:
 
** 1mbit:
 
*** preamble long/short: 192 / 96 µs
 
*** preamble long/short: 192 / 96 µs
 
*** 802.11ack = 14 Bytes
 
*** 802.11ack = 14 Bytes
 
*** 8 Bit / Symbol -> 1375000 Symbole / 11 / Sekunde = 125000 Symbole/s
 
*** 8 Bit / Symbol -> 1375000 Symbole / 11 / Sekunde = 125000 Symbole/s
*** SIFS = 10 µs
+
*** SIFS / SLOT / DIFS = 10 µs / 20 µs / 2 x SLOT + SIFS = 50 µs
*** SLOT = 20 µs
  −
*** DIFS = 2 x SLOT + SIFS = 50 µs
   
*** 802.11-Frame = DIFS + long_preamble + TCP + long_preamble + 802.11ack + SIFS
 
*** 802.11-Frame = DIFS + long_preamble + TCP + long_preamble + 802.11ack + SIFS
*** TCP-DATA = DIFS + long_preamble + TCP_HEADER/DATA + long_preamble + 802.11ack + SIFS
+
*** TCP-DATA:
 +
**** = DIFS + long_preamble + TCP_HEADER/DATA + long_preamble + 802.11ack + SIFS
 
**** = 50 + 192 + (1536/1,375*11)=12288 + 192 + (14/1,375*11)=112 + 10 = 12844 µs
 
**** = 50 + 192 + (1536/1,375*11)=12288 + 192 + (14/1,375*11)=112 + 10 = 12844 µs
*** TCP-ACK = DIFS + long_preamble + TCP_HEADER/ACK + long_preamble + 802.11ack + SIFS
+
*** TCP-ACK:
 +
**** = DIFS + long_preamble + TCP_HEADER/ACK + long_preamble + 802.11ack + SIFS
 
**** = 50 + 192 + (76/1,375*11)=608 + 192 + (14/1,375*11)=112 + 10 = 1164 µs
 
**** = 50 + 192 + (76/1,375*11)=608 + 192 + (14/1,375*11)=112 + 10 = 1164 µs
*** ALL = 12844 + 1164 = 14008 => 71,3/s * 1460 = 104226 Bytes/s = 6,25 MB/min
+
*** ALL:
 +
**** = 12844 + 1164 = 14008 => 71,3/s * 1460 Bytes = 104226 Bytes/s = 6,25 mB/min = 375,2 mB/h
 +
*** 1mbit, Fragmentierung 256
 +
*** TCP-DATA:
 +
**** = 50 + 192 + (256/1,375*11)=2048 + 192 + (14/1,375*11)=112 + 10 = 2604
 +
*** ALL:
 +
**** = 2604 + 1164 = 3768 => 265,4/s * 256 Bytes = 67940 Bytes/s = 4,08 mB/min = 244,6 mB/h
 +
 
 
** 6mbit:
 
** 6mbit:
 
** 12mbit:
 
** 12mbit: